On Tue, Feb 6, 2018 at 12:03 AM, Sagi Grimberg [off-list ref] wrote:

irq-am library helps I/O devices implement interrupt moderation in
an adaptive fashion, based on online stats.

The consumer can initialize an irq-am context with a callback that
performs the device specific moderation programming and also the number
of am (adaptive moderation) levels which are also, abstracted and allows
for device specific tuning.

The irq-am code will sample once every nr_events and will check for significant
change in workload characteristics (completions per second, events per second)
and if it detects one, will perform an am level update(called a step).

The irq-am code  assumes that the am levels are sorted in an increasing order when
the lowest level corresponds to the optimum latency tuning (short time and low
completion-count) and gradually increasing towards the throughput optimum tuning
(longer time and higher completion-count). So there is a trend and tuning direction
tracked by the moderator. When the moderator collects sufficient statistics (also
controlled by the consumer defining nr_events), it compares the current stats with the
previous stats and if a significant changed was observed in the load, the moderator
attempts to increment/decrement its current level (step) and schedules a program
dispatch work.

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
---
 include/linux/irq-am.h | 116 +++++++++++++++++++++++++++++++

Talking to Tal, it seems that this is what landed in upstream as
include/linux/net_dim.h
and can have few adjustments for you, I suggest you take a look